package com.ndp.fb.walle.config.json;

import org.springframework.beans.BeanUtils;

import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.*;

/**
 * Created by hunk.qin on 2016/3/17.
 */
public class JsonPropertyUtil {

    private static List<String> groovyProperty=new ArrayList<>();
    static {
        groovyProperty.add("metaClass");
        groovyProperty.add("errors");
        groovyProperty.add("version");
    }
    public static Set<String> jsonProperty(Class clazz){
        clazz.getConstructors().toString();
        PropertyDescriptor[] propertyDescriptors = BeanUtils.getPropertyDescriptors(clazz);
        Set<String> set=new HashSet<>();
        for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
            if(propertyDescriptor.getWriteMethod()!=null&&propertyDescriptor.getReadMethod()!=null){
                set.add(propertyDescriptor.getName());
            }
        }
        return set;
    }

    public static String []  jsonPropertyArray(Class clazz){
        Set<String> set = jsonProperty(clazz);
        return set.toArray(new String [set.size()]);
    }

    public static void  addJsonClassProgertyForClass(ComplexPropertyPreFilter complexPropertyPreFilter,
                                                     Class<?> clazz,boolean isGroovy) throws IOException, ClassNotFoundException {
            Set<String> proprtySet = jsonProperty(clazz);
            if(isGroovy)
                proprtySet.removeAll(groovyProperty);
            complexPropertyPreFilter.addIncludes(clazz,proprtySet.toArray(new String[proprtySet.size()]));
    }

    public static void  addJsonClassProgertyForPackage(ComplexPropertyPreFilter complexPropertyPreFilter,String packageName,boolean isGroovy) throws IOException, ClassNotFoundException {
        Class[] classes = getClasses(packageName);
        for (Class clazz : classes) {
           Set<String> proprtySet = jsonProperty(clazz);
           if(isGroovy)
               proprtySet.removeAll(groovyProperty);
            complexPropertyPreFilter.addIncludes(clazz,proprtySet.toArray(new String[proprtySet.size()]));
        }
    }

    /**
     * Scans all classes accessible from the context class loader which belong to the given package and subpackages.
     *
     * @param packageName The base package
     * @return The classes
     * @throws ClassNotFoundException
     * @throws IOException
     */
    private static Class[] getClasses(String packageName)
            throws ClassNotFoundException, IOException {
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        assert classLoader != null;
        String path = packageName.replace('.', '/');
        Enumeration resources = classLoader.getResources(path);
        List<File> dirs = new ArrayList();
        while (resources.hasMoreElements()) {
            URL resource = (URL) resources.nextElement();
            dirs.add(new File(resource.getFile()));
        }
        ArrayList<Class> classes = new ArrayList();
        for (File directory : dirs) {
            classes.addAll(findClasses(directory, packageName));
        }
        return classes.toArray(new Class[classes.size()]);
    }
    /**
     * Recursive method used to find all classes in a given directory and subdirs.
     *
     * @param directory   The base directory
     * @param packageName The package name for classes found inside the base directory
     * @return The classes
     * @throws ClassNotFoundException
     */
    private static List findClasses(File directory, String packageName) throws ClassNotFoundException {
        List classes = new ArrayList();
        if (!directory.exists()) {
            return classes;
        }
        File[] files = directory.listFiles();
        for (File file : files) {
            if (file.isDirectory()) {
                assert !file.getName().contains(".");
                classes.addAll(findClasses(file, packageName + "." + file.getName()));
            } else if (file.getName().endsWith(".class")) {
                classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
            }
        }
        return classes;
    }

}
